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1.被动语态中be形的确定；
2.主动语态中省略to的宾补在被动语态中须 补上to.
［复习要点一］
Tom broke the window.? ?
The window was broken by Tom.
判断英语中谓语动词的语态：
（前者表示句子的主语为动作的发出者，后者表示句子的主语为动作的承受者。）
?
（被动语态）
（主动语态）
主动语态和被动语态结构的转换：
时态不同，be形不同
［复习要点三］
［复习要点二］
主语+谓语动词+宾语
主语+be+动词过去分词+by+宾语
She waters the flowers every day.
The flowers
every day.
are watered
by her
The students planted many trees in 2006.
Many trees were planted by the students in 2006 .
My daughter will feed the ducks tomorrow.
The ducks will be fed (by my daughter) tomorrow.
.
They have done their homework for one hour .
Their homework has been done by them for one hour .
She can do these actions well.
These actions can be done well by her.